Make fec controller plug-able.

Bug: webrtc:8656
Change-Id: I3d42ffc92a7c95266e5d53bab03f388bd0de2592
Reviewed-on: https://webrtc-review.googlesource.com/39760
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Ying Wang <yinwa@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21710}

modules/video_coding/fec_controller_default.h

@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_VIDEO_CODING_FEC_CONTROLLER_DEFAULT_H_
+#define MODULES_VIDEO_CODING_FEC_CONTROLLER_DEFAULT_H_
+
+#include <memory>
+#include <vector>
+#include "api/fec_controller.h"
+#include "modules/include/module_common_types.h"
+#include "modules/video_coding/media_opt_util.h"
+#include "rtc_base/criticalsection.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+
+class FecControllerDefault : public FecController {
+ public:
+  FecControllerDefault(Clock* clock,
+                       VCMProtectionCallback* protection_callback);
+  explicit FecControllerDefault(Clock* clock);
+  ~FecControllerDefault();
+  void SetProtectionCallback(
+      VCMProtectionCallback* protection_callback) override;
+  void SetProtectionMethod(bool enable_fec, bool enable_nack) override;
+  void SetEncodingData(size_t width,
+                       size_t height,
+                       size_t num_temporal_layers,
+                       size_t max_payload_size) override;
+  uint32_t UpdateFecRates(uint32_t estimated_bitrate_bps,
+                          int actual_framerate_fps,
+                          uint8_t fraction_lost,
+                          std::vector<bool> loss_mask_vector,
+                          int64_t round_trip_time_ms) override;
+  void UpdateWithEncodedData(const EncodedImage& encoded_image) override;
+
+ private:
+  enum { kBitrateAverageWinMs = 1000 };
+  Clock* const clock_;
+  VCMProtectionCallback* protection_callback_;
+  rtc::CriticalSection crit_sect_;
+  std::unique_ptr<media_optimization::VCMLossProtectionLogic> loss_prot_logic_
+      RTC_GUARDED_BY(crit_sect_);
+  size_t max_payload_size_ RTC_GUARDED_BY(crit_sect_);
+  RTC_DISALLOW_COPY_AND_ASSIGN(FecControllerDefault);
+};
+
+}  // namespace webrtc
+#endif  // MODULES_VIDEO_CODING_FEC_CONTROLLER_DEFAULT_H_